Gear-teeth calipers.



T; KOPINSK!I GEAR TEETH CALIPERS.

APPLICATION FILI-:D MAI/3.1915.

1,156,694. Patented OCI-12, 1915. I

-.oI.U.\\n|A PLANOGRAPH co., WASHINGTON. D. c.

THOMAS KOPINSKI, 0F ROCHESTER, NEW YORK.

GEAn-'TEETH CALIPERS. 1

specification of Letters Patent.

Application inea May 3, 1915. serial No. 25,489.

T 0 all whom t may concern.'

Be it known that I, THOMAS KorINsKI, a subject of the Emperor of Germany, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Gear- Teeth Calipers, of which the following is a specification.

This invention relates to certain new Vand useful improvements in gear teeth calipers.

The primary object of the present invention is to provide a double-reading measuring instrument for calculating thel depth,

breadth and span of gear teeth although the device is capable of measuring any short distances within the limits of the device, the readings being readily made from both a diametral and a metric scale, by.diametr'al being understood a scale for laying out gear teeth to the commonly used diametral pitch.

It is further designed to provide a caliper of simple and cheap construction having an adjustably-mounted diametral scale mounted thereon while a corresponding metric scale is coperatingly carried by the relatively shiftable caliper arms.

I.Vith these general objects in view and others that will appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts to be hereinafter more fully described and then claimed.

In the accompanying drawings forming part of this application and to which reference is had herein by like characters designating corresponding parts throughout the several views z-Figure 1 is a front elevation of the device. Fig. 2 is a transverse sectional view thereof upon line II-II of Fig. 1, and Fig. 3 is a similar sectional View upon line III-III of Fig. 1.

By referring to the drawings, it will be noted that similar caliper arms 10 and 11 are provided having pointed work-engaging ends 12 and oppositely-arranged disk heads 13, while the arms are pivoted together by means of a central rivet 14 extending through the said heads. The heads 13 are provided with projecting pointing or indicating fingers 15 in diametrical alinement with the arms 10 and 11.

A double quadrant-shaped scale plate 16 has Vits base 17 pivoted upon the rivet 14 at the rear of the arms 10 and 11 in such a manner that the pointer ends 18 of the iingers l5 will freely pass over the face of the scale plate 16. The said scale plate is provided with one inch markings 18 while the peripheral markings 19 denote eighths of an inch or diametral indications, it being seen that the readings increase in opposite directions from the zero line 20.

A protecting bar 21 is connected at its opposite ends to the rear side of the scale base 17 and at the opposite ends thereof and spans the arms 10 and 11 as well as the face of the scale base for the purpose of protecting the same.

A curved scale 22 is secured at one end as at 23 to the outer face ofthe overlying arm 10 and is slidably positioned through a U- shaped guide strap 24 carried by the other arm 11 of the caliper and in which manner the scale slides over the face of the caliper arm 11 and the readings upon the scale may be readily determined as indicated by the position of the strap 24. The scale 22 is provided with metric scale markings, the graduated divisions 25 thereof denoting centimeters and the shorter graduations 26 denoting millimeters. In measuring any distances with the present instrument, such as gear teeth, the points 12 of the arms 10 and 11 are accurately positioned upon the work and whereupon the pointers 18 will denote such distances in dimensions upon thescale plate 16, it being seen thatthe caliper is illustrated in Fig. 1 on the present drawings as indicating a distance of two inches. By referring to the ruler 22, the same distance may be instantly read in millimeters and.

centimeters, it being seen that in the present instance, the ruler 22 denotes a distance of 50.8 millimeters or 5.8 centimeters. It is to be noted that, by means of this construction the fingers 15 may be adjusted to lie equally spaced from the zero point of the scales on the quadrant. v

The instrument may be readily employed in this manner for instantly and accurately' measuring in both the diametral and metric systems in distances falling within the limit of the device, such measurements being read- `ily readable by glancing at the respective scales upon the scale plate 16 and Vthe ruler 22.

What I claim as new is In combination, a pair of caliper arms provided with work-engaging ends and having oppositely disposed heads, a pivot conratented 0eme, i915.

necting the heads, indicating fingers eXtend- In testimony whereof l afliX my signalng from the heads, and a segmental scale ture in presence of two Wltnesses.

plate havinO its base pvotally mounted 0n y the pvot arzd provided with a lpair of aro- THOMAS BOPINSKI 5 nate scales over which the indicating fingers Vtnesses:

travel, said scales eXtendlng both dlrectlons H. H. SIMMs, from a central zero polnt.` y ADA M. VHITMORE.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

